[clang] [clang][Darwin] Remove legacy framework search path logic in the frontend (PR #138234)

[Vitaly Buka via cfe-commits]

vitalybuka wrote:

> That passes for me. I can't even figure out which unit test is failing, they all say `OK` and not `FAILED`. The one error in there looks like it's expected since its test still returns `OK`. Are we totally sure this isn't an infrastructure issue?

Unlikely.
Process exits with -6 - abort, and "libc++abi: Pure virtual function called!" does not look right


https://github.com/llvm/llvm-project/pull/138234